Teleportation
I have an ongoing discussion with one of my friends about teleportation. Suppose some day a scientist invents a teleportation device. You walk in one end, your body is zapped, and you reemerge in another location (think Star Trek). Will the person who emerges from the other end have the same consciousness as the person who was zapped? I’m skeptical. The being that reemerges will surely act like the same person if reconstruction is perfect. This will lead others to believe that the transportation was successful. However, I think the person who walked in is effectively dead. Let’s think of it this way – if the same device was used to clone somebody, would the clone and the original share a single consciousness? I don’t think that’s plausible. This raises a scary prospect – if teleportation becomes feasible and popular, there will appear to be no problem until you walk in, and your life will end right there. Everybody else will carry on as usual, thinking the being that emerged from the other end is you.
On the other hand, this type of dynamic might be more common than we realize. For example, suppose our consciousness dies every time we sleep. The being that wakes up the next morning retains the same memories, so there will be no realization that something is out of place. Carpe diem takes on a new meaning here. Literally, today is the first and last day of your existence.

